/*
 * Copyright (c) 2010-2011, Monash e-Research Centre
 * (Monash University, Australia)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 	* Redistributions of source code must retain the above copyright
 * 	  notice, this list of conditions and the following disclaimer.
 * 	* Redistributions in binary form must reproduce the above copyright
 * 	  notice, this list of conditions and the following disclaimer in the
 * 	  documentation and/or other materials provided with the distribution.
 * 	* Neither the name of the Monash University nor the names of its
 * 	  contributors may be used to endorse or promote products derived from
 * 	  this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package edu.monash.merc.struts2.validator;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.opensymphony.xwork2.validator.ValidationException;
import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport;

/**
 * NameValidator class provides the name validation
 *
 * @author Simon Yu - Xiaoming.Yu@monash.edu
 * @version 2.0
 */
public class PasswordIntegrityValidator extends FieldValidatorSupport {

	static Pattern digitPattern = Pattern.compile("[0-9]");

	static Pattern letterPattern = Pattern.compile("[a-zA-Z]");

	static Pattern specialCharsDefaultPattern = Pattern.compile("!@#$");

	private String specialCharacters;

	public String getSpecialCharacters() {
		return specialCharacters;
	}

	public void setSpecialCharacters(String specialCharacters) {
		this.specialCharacters = specialCharacters;
	}

	@Override
	public void validate(Object object) throws ValidationException {
		String fieldName = getFieldName();

		Object value = this.getFieldValue(fieldName, object);
		if (!(value instanceof String)) {
			addFieldError(fieldName, object);

		} else {
			String fieldValue = (String) value;

			fieldValue = fieldValue.trim();

			if (fieldValue.length() == 0) {
				addFieldError(fieldName, object);
			} else {
				Matcher digitMatcher = digitPattern.matcher(fieldValue);
				Matcher letterMatcher = letterPattern.matcher(fieldValue);
				Matcher specialCharacterMatcher = null;

				if (getSpecialCharacters() != null) {
					Pattern speciallPattern = Pattern.compile("[" + getSpecialCharacters() + "]");
					specialCharacterMatcher = speciallPattern.matcher(fieldValue);
				} else {
					specialCharacterMatcher = null;
				}

				if (!digitMatcher.find()) {
					addFieldError(fieldName, object);
				} else if (!letterMatcher.find()) {
					addFieldError(fieldName, object);
				} else if (specialCharacterMatcher != null && !specialCharacterMatcher.find()) {
					addFieldError(fieldName, object);
				}
			}
		}
	}
}
